azurite


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azurite

(ăzh`ərīt), blue mineral, the basic carbonate of copper, occurring in monoclinic crystals or masses that range from transparent to translucent and opaque. It is usually associated with malachitemalachite
, a mineral, the green basic carbonate of copper occurring in crystals of the monoclinic system or (more usually) in masses. It is translucent or opaque; the luster is silky, vitreous, adamantine, or dull. It takes a good polish.
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, which it resembles except in color; when the two minerals are very closely associated, the stone is called azurmalachite. Beautiful crystals of azurite are found in the United States in Arizona and New Mexico and in France at Chessy (for which the mineral is sometimes called chessylite); they are used for ornamental purposes. The mineral is an important ore of copper.

Azurite

 

a mineral belonging to the class of carbonates. The chemical composition of azurite is Cu3[Co3]2(OH)2. Azurite crystallizes in a monoclinic system, forming tabular or prismatic crystals that are dark blue in color. It is frequently found in powdery masses, mud, and other substances (blue malachite). Its cleavability is unsure and unidirectional, and it has a bright, glasslike luster. Azurite has a hardness of 3.5–4 on the mineralogical scale and a density of 3,770–3,890 kg per cu m. It is easily dissolved in acids, with the release of carbon dioxide.

Azurite is formed on the earth’s surface by the oxidation of the primary mineral ores of copper—copper pyrites, bornite, fahlerz, and others. Minerals associated with azurite are native copper, malachite, cuprite, chrysocolla, and other minerals found in zones where copper deposits are subject to oxidation. The copper content of azurite is 55.3 percent, and it is a valuable copper ore. Azurite is also suitable for the preparation of deep blue paints.

azurite

[′azh·ə‚rīt]
(mineralogy)
Cu3(CO3)2(OH)2 A blue monoclinic mineral consisting of a basic carbonate of copper; an ore of copper. Also known as blue copper ore; blue malachite; chessylite.
References in periodicals archive ?
This paper will reflect on the project technical and economic drivers that led the Azurite project team to select the FDPSO concept.
The blue azurite typically forms irregular brecciated masses within the green malachite matrix.
The RI and SG values ruled out chrysocolla, and although the SG was somewhat higher than expected for azurite (cf.
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At certain places porphyry type copper mineralization is well observed within the diorite, where leaching of the Cu-bearing phases to malachite and azurite is common.
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Malachite after Azurite on Calcite Concepcion del Oro, Zacatecas Mexico 2" tall ex-collection W.
In late September, we further expanded and filled in our geographic footprint with the acquisition of the Azurite companies, which increased our presence in the Ark- La-Tex market, one of the fastest growing markets in the United States.
The copper mineralization at Bay L'Argent consists of: chalcocite, malachite, and locally bornite, azurite, cuprite, and covellite which replaces diagenetic pyrite.
Murphy Oil Corporation (NYSE:MUR) announced that initial oil production has commenced at its Azurite field in the Mer Profonde Sud (MPS) block, in territorial water (Atlantic Ocean) of the Republic of Congo (Brazzaville).
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